<template>
<div class="list" ref="wrapper">
  <div>
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wrapper">
          <div class="button">{{this.currentCity}}</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class="button-list">
        <div class="button-wrapper" v-for="item in hotCity" :key="item.id"
         @click="handleCityClick(item.name)">
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
    <div class="area" v-for="(item, key) in cities" :key="key" :ref="key">
      <div class="title border-topbottom">{{key}}</div>
      <div class="item-list">
        <div class="item border-bottom" v-for="v in item" :key="v.id" @click="handleCityClick(v.name)">
          {{v.name}}
        </div>
      </div>
    </div>
  </div>
</div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hotCity: Array,
    cities: Object,
    letter: String
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  computed: {
    // 展开运行符 mapState是指把vuex里的数据映射到这个组件的computed计算属性里
    // 也可以是对象
    // 把vuex里面的city这个公用的数据映射到这个组件的计算属性里，映射过来的名字叫做currentCity
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    // 热门城市点击事件
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city)
      // this.$store.commit('changeCity', city) 改为下面代码
      this.changeCity(city)
      this.$router.push('/')
    },
    // 有一个mutations叫changeCity，然后把这个mutations映射到组件里一个名字叫changeCity的方法里
    ...mapMutations(['changeCity'])
  },
  // 侦听器
  watch: {
    letter () {
      console.log(this.letter)
      // better-scroll提供的接口
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // console.log(element)
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.border-topbottom
  &:before
    border-color: #ccc
  &:after
    border-color: #ccc
.border-bottom
  &:before
    border-color: #ccc
.list
  overflow: hidden
  position: absolute
  top:1.58rem
  left:0
  right:0
  bottom:0
  .title
    line-height: .54rem
    font-size: .26rem
    background: #eee
    color: #666
    padding-left: .2rem
  .button-list
    overflow: hidden
    padding: .1rem .6rem .1rem .1rem
    .button-wrapper
      float:left
      width:33.33%
      .button
        margin: .1rem
        padding: .1rem 0
        text-align: center
        border: .02rem solid #ccc
  .item-list
    .item
      line-height: 0.76rem
      color: #666
      padding-left: .2rem
</style>
